While the generic moniker " blue light " was retained, the pyrotechnic signal was meant to burn with a vivid, white light.
2.
A postwar correspondent wrote that " two blue lights " were the prearranged signals, and a lookout on the " Housatonic " reported he saw a " blue light " on the water after his ship sank . " Blue light " in 1864 referred to a pyrotechnic signal in long use by the U . S . Navy.
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